Drying apparatus.



e. H. MAY 5w. M. enosvmma.

, DRYING APPARATUS. APPI IOATIOH rinnn 1:43.24. 1909 Patented Dec, 27,1910.

5 SHEETS-BREE! 1,

0 Jig MWW G. H. MAY & W. M. GROSVENORL DRYING APPABATUS. APPLIOATIOHFILED MAR. 24 1999.

Patented Dec. 27, 1910.

G. H. MAY 6: W. MLGROSVBNOR.

DRYING APPARATUS.

urLmA'nox rump urn- 24. 1909.

Patentd. Dec. 27, 1910.

5 SHEETS-SHEET 3.

mammals;

44 %MZM Patented Dec.27,1910.

6 SHIIBTk-BHEE'I 4.

s xi'l lllllllllili DRYING APPARATUS.

APPLIUATIOI FILED KAI. 24. 1809.

II n lmmlllllm G. H. MAY 6: W. M. GROSVENOR.

@H@ @Mmv amen/17oz:

5 SHEETS-SHEET 5 Patented Dec. 27, 1910.

DRYING APPARATUS.

APPLICATION FILED MAR. 24, 1909.

e. H. MAY & W. MfGROSVENOR.

l l I v I I UNITED STATES P ENT OFFICE.

GEORGE H. Meat, or NEWBUBGH, NEW YORK, AND WILLIAM anan'rwoon, NEWJERSEY,

m. GROSVENOB, or

DRYING APPARATUS.

Patented Dec. 27, 1910'.

11 all 'who'm it may concern:

Be it known that we, Gnoncn H. MAY and lViLLIAM M. GRosvnNoR, citizensof the United States, and residents, respectively, of Newburgh, Orangecounty, New York, and (.lrrantwood, Bergen county, New Jersey,

, have invented a certain new and useful the solvents to be recovered sothat they- Drying Apparatus, of which the following isa specification.The invention relates to an improvement in drying apparatus, for dryingpaper, or

'cloth,' or other material, in the web, and it is especially applicableto the coating and drying of materials such aswater-proofed cloth aper'in which there is applied to the sur ace of the material somecomposition containing solvents, such asbenzin or turpentine.

The objects of the invention are to enable the material to be passedthrou h .the a paratus continuously, and to be 'ried whi e passingtherethrough; to dry the material quickly anduniformly, and thereby tosecure economy andat the same time to produce a superior quality ofgoods; to enable may be used over and'bve'r again,.'thus-se curingeconomy and preventing waste; to

enable substantially thesame body of air or heating medium to be usedover and over again, thereby preventin loss of heat and aiding in therecovery 0' the solvents, and

securing more uniform drying; to enable the material to be passedbackward and forward through the ap aratus without having to remove thesame rom its supporting devices and without relieving the samefromtension while it is passing through the apparatus, and withoutsubstantial loss of time; to keep the material under the proper tensionso as to revent. it from becoming warped or wrink ed or uneven, toprevent sparking in the apparatus which might lead to explosions, and toprovide means whereby any explosion that 'may occur will be renderedrelatively harmless; to provide a coating device for coating thematerial, which shall be accessible and visible, and which shall be soarranged as to substantially prevent the escape of vapors from theevaporating chamber} and in other ways to improve the construction andoperation of the apparatus.

The invention consists first in the combination with an evaporatingchamber'which ing chamber and be material can be .tinuous circulation ofthe drying medium,

and condensing'means in said condensing chamber, heating means suitablyplaced in connection with the evaporating and con- -densing chambers soas to heat the drying medium after passing through the condenso chamber,and tension an holding and driving devices by means of which thematerial 'can be continuously passed through the evaporating chamber andsubjected to the action of the dr ing medium, whereby the ried in acontinuous operation, and can be supported and held under such tensionand in such a manner as to dry the same uniformly and without causing itto warp or wrinkle. This art of. the inven- 'tion also consists in proviingsuch driving re it comes into contact with the material which isbeing dried,

. is provided with any suitable form of heatand holding and tensiondevices at each end I of the apparatus, so that the material can bepassed ineither direction through the evaporating chamber, and back andforth as many times as may be necessary without disturbingthe materialor relieving it from tension, and without substantial loss of time.

The invent-ion also consists, in providing means for applying thecoating to the material within the evaporating chamber, or anextensionthereof, so constructed as to prevent, so far as is possible,the loss of the vapor from the evaporating chambegfand so constructedthat the apparatus for applying the coating maybe readily seen andeasily accessible.

The invention also consists in certain driving and supportingmechanismby means of which the directionimwhich the material I that whenone roll of. material has been dried, another rol l may be'convenientlyap plied to the machine. I I y The invention also consists in providingbearing surfaces against which the material bears and by which it is.supported in i ts passage through the evaporating chamber, and ingrounding these devices so as to prevent sparking and thereby prevent ordimin ish the danger ofexplosion of the gases, which may be more or'lessinflammable in character. This part of the invention also consists inproviding the evaporating chamber with one or more walls of yieldingmaterial, and makingthe other walls substantially rigid whereby if anyexplosion occurs the yielding wall or walls will be rent but the rest ofthe apparatus will be uninjured. The invention consists of otherfeatures of construction and combinationsof parts hereinafter describedand claimed. Theapparatus 1s shown in the accompany;

ing drawlngs in which Figure 1 is aplan view of the twoendsof theapparatus-showing the driving and holding and tension devices, themiddle portion of the machine being broken'away; Fig.2 is a verticallongi-.

t-udinal sectional View of one end of the apara-tus, including a portionof the evaporatmg chamber; Fig. 3 is a vertical longitudinal sectionalView of the other end of the.

apparatus, said view passing through the condensing chamber so as toshow the pipestherein; Fig.4 is a vertical vcross-sectional view throughthe middle of the apparatus; Fig. 5 is aside elevation of one end of themachine; and Fig. 6 is an end elevation of the same end of the machine,being partly;

broken away. I I 1 Similar numbers indicate s'nmlar parts 1n thedifferent figures.

Referring to the drawings, 1 isthe evaporating chamber, which may 'bemade of any suitable form and size. It is provided with walls 2, 2 ofany suitable material, which are constructed, so. as to be substantiallyrigid, and thus to withstand thefo-rce of any explosion that may occurwithin the apparatus. These wall's'are constructed so ,as'to besubstantially impervious to the gases, and so as not to be aifec'ted bythe temperatures employed in the apparatus and so astobe substantiallyfireproof. These walls are preferably provided with a metal lining. 3

.made of suitable material. This material must 'beofsuch a nature as notto be acted upon by the vapors or gases which are used or producedinthe-apparatus.- This metal lining aids in making the walls of theapparatus rigid, andalso aids in grounding the bearing surfaces uponwhich the material rides as hereinafter explained. In the ,form shown inthe drawingsthe upper wall or covering 4 is made of a thin cloth orwebbing which can be easily torn soas not to confine the gases incase ofsuch explosions as mayccc'ur with the mixturev of gases present in theap aratus'. 3 J .11

5,.5arebearing sur aces made of metal, preferably of copper plate, uponwhich or over which the material moves. Thesebear; ing surfaces aresupported in any'suita'ble manner. In the form -show ings the wall ofthe evapora g chamber is provided with supportingo' strengthening ribs 6suitably bolted in place, and these ribs n the drawg iii:

support the crossbars 7 which carry the bea'ring surfaces '5. Thecrossbars 7 are bolted to the other side wall of the'evaporatin'gchamber in any convenient manner. The bearing pieces 5' are groundedelectrically by electrical conductors arranged in any suitable manner.'In the form shown 8 are the wires connecting the ,bearing' p-iecest)with the metal lining 3 of the evaporating chamber, and 9 are wiresconnecting the metal lining with the heating pipes 10 placed at thelower part of theevaporating chamber, or in any other'suitablelocation.

, 11,11 are baflle plates extending throughfoutthe length of theevaporating chamber,

and projecting from the sides of the cham- I ber toward the middlethereof in the man'- ner clearly shown in Fig, These baflle plates causethe ascending current of air to pass to the middle of thechamber andthen underneath the material, to the edges thereof; and then across thetop of the materialfto themiddle thereof, and then upwardly to the topof the evaporating chamber.

'12 represents the' 'lna'terial which is'being r d-L 13 is thecondensing chamber w'hich is separated from the evaporating chamber bythe wall 14, and which 1s connected withthe evaporating chamber at thetopand the bottom, as shown, to permit of a continuous circulation ofthe drying mediuni'np through the evaporating chamber, 'thenQ'intd thetop of the condensing 'cha'm'ber, then down through the condensingchamber, and then maintain. a suitable temperatureli'n'the'con- Idensing chamber; 16 is a trough or receptacleto receive or catch thecondensed liquld or solvent which 'is condensed out of the dryingmedium. The

pipe 15 is continued to thevery bottom of tank 16 so as to keep theliquid or solvent is a dischargepipe leading from the receptacle 16through which the liquid or solvent can be discharged and recovered fromthe apparatus so that it can be again used in preparing the materialwhich is being fed into the apparatus, or in preparing the coating to beapplied thereto.

18 is a by-pass in the condensing chamberto permit the drying medium toescape past the receptacle 16. 3

19 is a hinged door forming one side of the condensing chamber by meansof which ready access may be had to the condensing chamber and thecondensing pipes.

20' is the supply pipe of the heating coil, and 21 is thereturn pipe ofthe same.

22 is a chamber for incl'osing the coating device. This chamber forms anextension of the evaporating chamber, and the walls of it are madesubstantiallytight so as to prevent so far as is possiblethe vapor .orsolventv in the evaporating chamber from 'escap-' .ing from theapparatus.

, 23, 23 are movable orvhinged covers in the upper wall .of the chamber22, provided with panes of glass 24, or other transparent material,through which the operation of the.

coating and spreading devices can be easily observed, and by means ofwhich ready access can be had to thesedevices.

25 is a spreading device or-knife which is adapted to slide up and downin the bearings 26 in the side walls of the chamber 22. This knife canbe inserted in place or removed from the apparatus by opening the hingedcover23 immediately above, and slipping the knife into or out of thebearings 26. The knife is made entirely of metal or ismade'with ametal'bearing. piece and is suitably grounded by connecting itelectrically with the metal frame 61, as by the Wire 62. This frame iselectrically connected 'in any suitable manner with the metal lining 3or the heating pipes. Any other suitable form of coating or spreading ordipping device, such as rollers or brushes, may be used.

27, 27 are rolls for supporting the' material on either side of thespreading device. These rolls are made of any suitable material. If

made of metal, or with a metal face, they must be suitably grounded; forexample,

they may be provided with contact brushes v 28. These contact brushesmay beconnected electrically with the metal lining of the chamber, so asto be electrically grounded.

-The rolls 27,are supported in any suitable bea'rings supported by thewalls of the cham- 29, 29 are rial, prefer-a pieces made of some springmately spring metal or sheet rubber,

between which'the materialpasses into the chamber 22. These springpieces form atight joint at the point where the material passes into thechamber 22 and-so prevent the substantial leakage of vapor from theapparatus. metal they must be suitably grounded.

IO If the pieces 29 are made of' The coating composition is held in anysuitable reservoirsuch as the tank 63,- which is connected by a pipe 64with a funnel 65. extending through an opening in the hingedcover 23 ata point outside-of the knife 25.

The pipe 64 is provided with a valve 66, and

. ing composition whichhas been fed on to the material.

The chamber 22 is provided with a recess or depression 30 formed by thewall of the chamber and adapted to receive the drip tank 31 which isplaced immediately below the spreading device so as to receive or catchany surplus of the coating composition which may drop down from thematerial. When the tank 31 is fall it. can be withdrawn through the door32 which is in the side of the chamber 22 and which is constructed so asto make when closed a substantiallyv air-tight joint with the wall ofthe chamber 22. Each end of the machine is provided with a chamber 22such as already described, with all the parts from 23 to 32 inclusive.Each end of the apparatus is provided with driving, holding and tensiondevices. These devices are ofthe same construction at both ends.

Referring to the drawings, 36 is a roller whichvacts asa receivingroller when its end of the machine is'used as the discharge end, and'asthe supply roller when its .end of the machine is used as the supplyend. This rolleris slipped on to a square shaft 35 Y mounted in suitablehearings in the frame of the machine.

37 is a drivingroller or drum, and 38 is an intermediate roll.

Referring to Fig. 2, and assuming that the end of the machine thereshown is the discharge end, the material 12 passes out of the chamber22, after being dried, and over the driving roller 37, and then over theintermediate roller 38 andv is then wound upon the receiving roller 36.These rollers are driven as follows. 39 is-a drum or pulley (see Fig.1), which is driven by any suitable means. 40 is a belt connecting thedrum 39 with the pulleyal which is fast upon the shaft 42. This shaftcarries the pinion 43 which meshes with the gear 44 on the shaft 45. Theshaft 45 carries the driving roller 37. 46 is a pulley fastened to theshaft 45. 47 is a belt conuectingthe pulley driven in such a directionas to drive the belt 40 in the direction indicated bythe arrow in thisfigure, the driving-roller 37 will thereon and to engage with the pulley51.

- the material on said roll.

be driven in such a direction as to draw the material through theevaporating chamber and toward its end of the same, and'the receivingroll 36 will be driven so as to wind By reason o-fthe respective sizesof the connecting pinions and gear wheels and pulleys, the tendency willbe to drive the receiving roller 36 faster than the roller 37, whichwill keep the goods taut and under the proper tension, but the belt andpulley arrangement will permit the belts to sli upon the pulleys, andthis slip motion will cause the speed of the receiving roller to beproperly adjusted with reference to the speed of the roller 37. 53 is aclutch of any suitable form fastened to the shaft 52 and adapted to bemoved longitudinally By means of this clutch the pulley 51 can befastened to the shaft 52 so as to revolve therewith, or can be unlockedfrom the said shaft so as to turn freely thereon. .54 is a handle foroperating said clutch. 55 is a brake or friction device of any suitableform adaptedto encircle and bear against-a disk on the shaft 52 so as toretard the motion of said shaft when the roller 36 is being usedas asupply roller, and thus to maintain a tension on the goods as they passfrom said roller. Any suitable form of .brake may be employed, and itsfriction on the shaft 52 may be regulated by any suitable adjustingdevice, for example thescrew 56. 57 is a pressure rolladapted to bearagainst the under side of the belt 50 to maintain the proper tension onsaid belt. It is mounted on the end'of an'arm 58 suitably pivoted to theframe of the machine, and carrying a weight. 59 at its other endwhichcanbe moved so as to adjust the pressure.

60 is a loose pulley on the shaft 42. 40' is .a belt connectingthe'pulley 39'with the loose pulley 60'- on the shaft 42'at the otherend of the machine. 41 is a fast pulley on the shaft 42 at the other endof the machine. The rollers and driving mechanism at the other end ofthemachine are the same'as those already described. 39 is revolved insuch a direction as to move the belt .40.- as indicated by thearrow inFig. l. the belt 40-is-rnnni'ng on the loose pulley 60' on the shaft 42at the other end When the drumof the machine, and the roller 36 atthe'other aend of the machine is acting as, a supply roller and is beingrevolved by the material itself which is being drawn through the 7machine by the roller 36- and the roller 37 at the discharge end. Theroller 36 at the supply end is retarded in its motion, and the goods arethereby heldunder tension by the operation of the brake 55. The roller36 is provided with an end wrapper, that is to say, with a strip ofmaterial which is fastened at one end to the roller, or which is woundupon it a sufficient number of times to be secured thereto, and which isadapted to be attached at the other end to the end of the material whichis to be dried in the apparatus. When a roll of material has been drawnthrough the apparatus, the end wrapper connected with it is drawnthrough theapparatus, and after its end has passed out of the dischargeend of the apparatus, this Wrapper is disconnected from the materialunless the material is to be drawn back through the Y apparatus. hen.the drying of the material is completed the material is separated fromthe end of the wrap per, and thewrapper is then ready to be attached tothe next piece of materialjto be dried in the apparatus. This endwrapper must be long enough to extend entirely through the apparatuswithout being disconnected or wholly unwound from its roller 36. Thisafi'ords an easy means of drawing any material into the apparatus," andit also enables the materialto be drawn entirely through the apparatus,and then drawn back again, and so on as many times as may be desired,thereby drying the ends of the material as thoroughly asthe middleportions. The operation of our machine is as" follows: A roller 36 witha roll of oods wound thereon is laced uponthe slia t 35. The inner endof t is roll is attached to the end of the wrapper connectedwith theroller 36. The free end of the roll of goods is then attached to thewrapper extending through the machine from the roller '36 at the otherend of the apparatus. The roller 36 bearing the roll of oods isdisconnected from the driving mec anism by throwing out the clutch 53.The roller 36 at the 'd i sthe material is placed in the tank'6 3, and"the valve 66 is so adjusted that this composition will befed'through thepipe 64 and the funnel 65 onto the material in suitable quantity. Theknife or spearing device 25 is inserted in its bearings at the supplyend of the machine, and--is properly adjusted therein so as to bear uponthe material with suitable pressure. This adjustment maybe made in anydesirable way, as by a key driven between the knife and the wall of thechamber. The knife is withdrawn from the other end of the apparatus. Theheating pipes 10 are heated 1n any suitable manner as by steam, and asuitable cooling fluid is-passed through the condensing pipe 15 H atsuch a temperature as to condense the vapor or solvent which is evaorated from the material in the evaporating chamber. The air Within theevaporatin chamber is heated at the bottom thereo and rises through thatchamber, and is deflected by the baflle lates' 11 and caused to flowfirst undernea the material, and then across its upper surface, andthereby heats and dries the same and carries off the evaporated moistureor solvent into the u per part of the eva orating chamber, an then flowsdown t rough the condensing chamber in which the moisture or solvent iscondensed,

being. caught in the receptacle 16- and, re-

( covered through the discharge pipe l'f. The

solvent can then be used over again in preparing the coating material.The current of drying medium'pas'ses through the bypass 18 ahd down intothe lower the evaporating chamber, and is t en reheated, and thus acontinuous circulation of drying medium is maintained by gravity or oter suitable means. The surfaces of the matelgia l are exposed uniformlyand thoroughly to the current of drying medium, and thus all parts ofthe material aredried uniformly, and at the same rate. The material canbe fed through the machine at any rate of speed desired, and-any desiredtemperature may be maintained in the evaporatm chamber. The materialpasses from the ro ler 36 at the supply end over the ihtermediate roll38, and then around the driving roller 37, and then between the I Ispring pieces: 29 into the chamber 22, and

7 held taut and under such tensichambers which form extensions of theover the rollers 27'and underneath the knife 25,-and then through theevaporatin chamher, .being supported therein by the aring surfaces '5',The material then asses over the rolls 27 at the discharge en outbetween the spring. pieces 29 and over the roller 37 and theintermediate roller'38,

and isthen Wound on the receiving roller 36/ During all this time thematerial is as may be desired. It is thus prevented tram wrinkling orwarping er; bending, and is exposed to the operation of the dryingmedium in a uniform condition. This greatly improves the quality of theproduct.

The coatin devices are contained in evaporating chamber, and which aretight so that the escape of moisture or solvent vapor contained n theevaporating chamber is preyented as far as possible. The points art ofturned through the apparatus in the opp of entry of the material, and ofexit between the spring pieces 29, are also tight, so that there is noleakage of gas therethrough- This results in substantial economyespecially where solvents are being used which are valuable, as in themanufacture of waterproofed cloth or paper. As the openingsthroughwhich't-he goods enter and leave the apparatus are on the same level,there is not the'same tendency for the heatedgases to escapefas therewould be if these openings were at different levels.

As the material or fabric to be treated asses through the machine, itspassage and riction over the rollers and under the knife,

are productive of static diflerences of potential, as are also thecontinued evaporation and condensation of liquid. This tends to producea sparking within the apparatus.

In spite of the regulation of condensation to obtain mixtures whichshall not be explosive,

there may be points where the vapor is 10- cally enriched orimpoverished to such an extent as to be explosive, and while this wouldnot produce a violent explosion, unless there were a large proportion ofthe vapor more or less in"this condition, it is important-to avoid evensuch milder combustion,.which would interrupt the operation of theapparatus and result in loss. By grounding all of the metallic rollersand bearing surfaces, and all other exposed metal surfacesin theapparatus as alreadyv described, such' sparking is substantially 'prevented- Should any explosion occur, however, the explosion would merelytear the thin coverl, and would not injure the rest of the apparatus, asthe other walls of the apparatus are made substantialiy rigid so as toresist any such explosion.

Any surplus of the coating mixture will 1 flow ,down past the edges ofthe material and'into the tank 30. From time to time this tank may bewithdrawn through the door 32, and emptied and then replaced.

The hinged doors 24, .24 with their transparent panes enable the coatingapparatus to be easily watched, and afi'ord ready access to the same.After the material has been passed through the apparatus it can be re-0- site direction by merely shifting the belts 40 and 40 on the drum 39so as to makethe belt 40 run on the loose pulley 60, and the belt 40'ran on the f ast pulley ll, and by clutching "the shaft 52 at what-is tobe the discharge end to its pulley 51 and unclutchin the shaft 52 at thesupply end from its pu ley 51. I

While in the form of apparatus shown the circulation bf the dryingmedium is due to gravity, it will be apparentthat t'he circulation maybe produced in any other well known way. u p

Many advantages are secured by our inback and forth through theapparatus withpassing supply end.

vent-ion. The material is dried 1uickly,'

uniformly and economically. The quality of the product is greatlyimproved. The solvents are recovered and may be used over and overagain. The escape of the solvent vapors-from the apparatus issubstantially prevented The composition or coating material is appliedwithin the apparatus itself so that there is no substantial lossofsolvent vapor at this point. The danger of injury or loss throughexplosion is reduced to a.

minimum, and provision is made whereby, if an explosion occurs, nosubstantial damage results therefrom. The machinecan be quickly reversedso as to pass the material out loss of time. The apparatus is simple andcompact. Other advantages are also secured, as-will be apparent from theabove description. I

;lVhat we claim as new and desire to 'secure by Letters Patent, is:

chamber suitably connected with the evaporating chamber, condensingmeans connected with said condensing chamber, means for heating thedrying medium. before it comes into contact with the material beingdried, electrical connections grounding the exposed metal surfaces inthe evaporating chamber, means at each end of the evaporating chamberforholding the material, and means for moving the material through theevaporating chamber.

'3. Ina drying apparatus, the combination of an evaporating chamber, acondensing chamber suitably connected with .the evaporating chamber,condensing means connected with said condensing chamberfheating means toheat the drying medium before it comes into contact with the materialbeing dried, means to support" the material while through theevaporating chamber, a driving roller at the discharge end, a receivingroller at the discharge end, means for driving the receiving roller, asupply -roller at the supply end, and means for putting a tension on thematerial at the 4. In a drylngapparatus, the combination of anevaporating chamber, a condensing chamber suitably connected with theevaporatin chamber, condensing means connected..w1tl1 said condensingchambenheating means to heat the drying medium before it comes intocontact with the material being dried, means to support the materialwhile passing through the evaporating, chamber, a

driving roller at the d scharge end, a receivin roller at the discharge.end, means for driving the: driving roller, and means for driving thereceiving roller at a variable speed so as to maintain the propertension on the material, a supfply roller at the supply end, and meansor putting a tension on the material at the supply end.

5. In a drying apparatus, the combination of an evaporating chamber, acondensing chamber suitably connected with the evaporatin chamber,condensing means connected w1th said condensing chamber, heating meansto heat the drying medium before it comes into contact with the materialbeing dried, means to support the material while passing through'theevaporating chamber, a driving roller' at the discharge end, a receivingroller at the discharge end, means for driving the driving roller, a'belt and pulley connection between the shaft of the driving roller andthe shaft of the receiving roller whereby the receiving roller is drivenat a variable speed so as to maintain the proper tension on thematerial, a supply' roller at the supply end, and means for putting atension on the material at the supply end.

6. In a drying apparatus, the combination of an evaporating chamber, acondensing chamber suitably connected with the evaporating chamber,condensing means connected with said condensing chamber, heating meansto heat the drying medium on its passagefrom the condensing chamber tothe material to be dried, means to support the materialwhile passingthrough the evaporating chamber, a driving and holding device at eachend of the evaporating chamber consisting of a roller to hold thematerial, means for driving said roller, and a disconnecting devicebetween the roller and said driving means, whereby the roller can turnin the reverse direction, a brake for the holding roller, and a drivinroller, whereby the material may be passe back and forth through the evaorating' chamber without being relieved rom tension while passingthrough said chamber.

7 In a drying apparatus, the combination of an evaporating chamber, acondensing chamber suitably connected with the-evapo-= rating chamber,condensing meansconnected with said condensing chamber, heating means toheat the drying medium on its passage from'the condensing chamber to thematerial being dried, means tosupport the material while passing throughthe vaporating chamber, a driving and holdin device at each end oftheevaporating chamber consisting of a roller to hold the material, meansfor driving said rollerat a variable speed soas to maintain the propertension on the material, and a disconnecting device between the rollerand said driving means, whereby, the roller can turn in the reversedirection, a brake for the holding roller, and a driving roller, andnieans fordriving the driving roller.

8. In a drying apparatus, the combination of an evaporating chamber, acondensing chamber suitably connected with the evaporating chamber,condensing means connected with said condensing chamber, a receptacle tohold the condensed liquid, heating means to heat the drying med umon-its passage from the condensing chamber to the material being dried,supporting devices to support the material while passin through theevaporating chamber, a driving and holding device at each end of theevaporating chamber consistiri of a roller to hold the material, meansdisconnectingdevice between the roller and said driving means, wherebythe roller can turn in the reverse direction, a brake for the holdingroller, and a driving roller, a driving pulley and means for connectingand disconnecting the driving pulley alternately with and from thedriving and holding devices at either end of the evaporating chamber.

S). In a drying apparatus, the combination of an evaporating chamber, acondensing chamber suitably connected with the evaporating chamber,condensing means connected with and from the driving and holding detohold the condensed liquid, heating means to heat the "drying medium onits passage from the condensing chamber to the material being dried,supporting devices to support the material while passing through theevaporating chamber, a driving and holding device at each end of theevaporating chamber consisting of a roller to hold the material, a brakefor the holding roller, and a driving roller, the driving pulley 39, thebelts 40 and 40, the fast pulleys 4G1 and 41,

the loose pulleys and 60', the shafts 42, the shafts 45 carrying the,drivingrollers, and geared to the shafts 42, the shafts 52 of theholding rollers, and belt and pulley connections between the shafts 45and the shafts 52.

10. In a drying apparatus, the combinatio'n of an evaporating chamber.a' condensing chamber suitably-connected with the evaporating chamber,condensing means connected w th sand condensing chamber, heatingmeans toheat the drylng medium on its passage from the condensing chamber to thematerial being dried, means to support the material while. passingthrough the evaporating chamber, a receiving roller at the dischargeend, means for driving the receiving roller, a supply roller at thesupor driving said roller, and a .ply end, means for putting a tensionon. the material at the supply end, and an end- 'wrapper connected wlth.the supply roller.

11.111 a drying apparatus, the combination of an evaporating chamber, acondensing chamber suitably connected with the evaporating chamber,condensing means miner-ted with said condensing chamber, fieating meansto heat the drying medium on its passage from the condensing chamber tothe material being dried, means to support the material while passingthrough the evaporating chamber, a drivingand holding device at each endof the 'evaporatingchamber consisting of a roller to hold the material,means for driving said roller, and a disconnecting device between theroller and said driving means, whereby the rollercan turn in the reversedirection, means for holding the material under tension, and an endwrapper connected with the holding.

roller at each endwhereby the entire ma-' terial may be passed back andforth through the evaporating chamber.

.12. In a dryingapparatus, the comblnation of an evaporating chamber, acondensing chamber suitably connected with the evaporating chamber,condensing means.

connected with said condensing chamber, heating means to heat the dryingmedium on its passage from the condensing chamber to the material beiIidried, means to support the material while'passing through theevaporating chamber, some of the walls of said chamber being made ofsuitable yielding material, and the other walls being tomparativelyrigid.

13.- In a drying apparatus, the combina- :tion of an evaporatingchamber, a condensing chamber suitably connected with the evaporatingchamber, condensing means in said condensing chamber, heating means toheat thedrying medium before it comes. into contact with the materialbeing dried, means to support the material while passing through theevaporating chamber, some of the walls of said chamber being made ofsubstantially impervious yiglding material, and the other walls beingcomparatively rigid. Q

14. In a drying apparatus, the combination of an evaporating chamber, acondens- 'ing chamber suitably connected wit-h the evaporating chamber,condensing means connected with said condensing chamber, heating meansto heat the drying medium on its passage from the condensing. chamber tothe material bein the material while passing through the evaporatingchamber, some of ,the Walls of said chamber being 'made of imperviousyielding material, and the other Walls being comparatively rigid, adrivin -roller at'the discharge end, a receiving rofier at the dischargeend, means forilriving'the receiving dried, means to, support roller, asupply roller at the supply end,

and means for putting 'a tension on the material at the supply end. I

15. in a drying apparatus, the combina-' tion of an evaporating-chamber,a condensing chamber suitably connected with the evaporating 7 chamber,condensing means- 'connected with said condensing chamber,

, heating means'toheat the drying medium 10 on its passage from thecondensing chamber to the material being dried, means to support thematerial while passing through the evaporating chamber, some of thewalls of said chamber being made of impervious yielding material, andthe other Wallsvbeing comparatively rigid, a driving and holding deviceat each end of the evaporating chamberconsisting of a roller to hold thematerial, means for driving. said roller, and a disconnecting devicebetween the lroller and said driving means, wherebythe, roller can turnin theu-everse directioma brake for the holding roller, and adrivingrollier. f

16. In a drying apparatus, the combinat-ioh -of an evaporating chamber,a condensing chamber suitably connected, with the evaporating chamber,condensing means connected with said condensing chamber,

v heating means to heat "the drying medium on its passage'from thecondensing chamber to the material being dried, bearing surfaces tosupport the 'material while passing through the evaporating chamber, andelectrical conductors connected with said bear ing surfaces and,grounding the same.

'17-. In a drying apparatus, the combination of an evaporating chamber,a condens-' ing chamber suitably connected with the evaporating chamber,condensing means 40 connected with said condensing chamber, heatingmeans to heat the drying medium on its passage fromthe condensingchamber to the material bein dried, bearing surfaces to support thematerial while passing through the evapprating chamber, and electricalconductors connected with said bearing surfaces and grounding the same,some -:of the walls of said chamber being made of n im ervious yieldingmaterial, and the other wa ls being comparatively rigid.

18. In. adrying apparatus, the combination of an evaporating chamber, acondensing. chamber. suitably connected with the evaporating chamber,condensing means 5 connected with said condensing chamber,

heating means to heat the drying-medium beforeit comes into contact withthe material being dried, bearing'surfaces to support the material whilepassing througlr'the evaporating chamber, and electrical con- Vvdu'ctors connected with said bearing surfaces and rounding the same, adriving-and hold ing device at each end of the eva orat-ing chamberconsisting of a roller to hol I the material, means for. driving, saidroller, and a 'material being dried, bearing surfaces to support thematerial, while passing throu h disconnecting device between the rollerand saiddrivingmeans, whereby the roller can turn in. the reversedirection, a brake for the holding roller, and a driving ro1ler.

19. In a drying apparatus, the combination of an evaporating chamber, .acondensing chamber suitably connected with the I evaporaing chamber,condensing means connected with said condensing chamber, heat-' ingmeans-to heat the drying medium on its passage from the condensingchamber to the material being dried, supporting devices tosupport thematerial while passing through the evaporating chamber, some of thewalls of said chamber being made of impervious yieldingmaterial, andthe, other walls being lined with-metal.

20. In a drying apparatus, the combination of an evaporating chamber, acondensing. chamber suitably connected with the evaporating chamberthereof, condensing .means connected with said condensing chamber,heatlng means to heat the.dry1ng medium before it comes into contactwith the thel evaporating chamber, some of the wa is of said chamberbeing made of impervious yielding material, and the other walls beinglined. with metal, the bearing surfaces being connected electricallywith the metal lining,

and the metal lining being electrically grounded.

21. In a coating and drying apparatus,the combination of an evaporatingchamber, a condensing chamber suitably connected with the evaporatingchamber, condensin means connected with said condensing c hamber,heating means to heat the drying medium on its passage fromthe'condensing chamber to the material to be dried, means for coat-- ingthe material with the coating substance, and for spreading it on saidmaterial, said coating and spreading means being inclosed in a c amberat the end of the evaporating chamber, and holding devices ateach endof. said evaporating chamber to maintain a tension on the material.

22. In a coating and drying machine, the combination of an evaporatingchamber, a 115 condensing chamber suitably connected withthe evaporatingchamber, condensing means connected with said condensing chamber,

heating means to heat the drying medium on its passage from thecondensing chamber to the material to be dried, means for coating thematerial with the coating substance and for spreading iton saidmaterial, said coating and spreading means being inclosed in a chamberforming an extension of the eva orating chamber, movable covers for saiextension chamber, and holding devices at eachend of said evaporatingchamber to maintain a tension on the material.

23. Ina coating and drying apparatus, the

the evaporating chamber, condensing means connected with said condensingchamber,

heating means to heat the drying medium before it comes into contactwith the material to be dried, means at each end of the evaporatingchamber for coating the material with the coating substance and forspreading iton said material, and holding and driving means at each endof said evaporating chamber.

'24. In a coating and drying apparatus, the combination of anevaporating chamber, a condensing chamber suitably connected with theevaporating chamber, condensing means'in said condensing chamber,heating means to heat the drying medium before it comes into contactwith the material to be dried, means to support the material whilepassing through the evaporating chamber, means at each end oftheevaporating chamber for coating the material with the coatingsubstance, and for spreading it on said material, said coating andspreading means being inclosed in a chamber forming an extension of theevaporating chamber at each end thereof, and holding and driving meansateach end of saidevaporating chamber.

25. In-a coating and drying apparatus, the combination of an evaporatingchamber, a condensing chamber suitably connected with the evaporatingchamber, condensing means connected with said condensing chainber,heating means to heat the drying medium on its passage from thecondensing chamber to the material to be dried, bearing surfaces tosupport the material While passing through the evaporating chamber, andelectrical conductors connected with said bearing surfaces andgroundingthe same, means for coating the material with the coating substance andfor spreading 1t on said material, said coating and spreading meansbelng lnclosed in a chamber forming an extension of the evaporating.chainber, and holding devices at each endof-said evaporating chamber tomaintain a tension on the material.

26. In a coating and drying apparatus, thecombination of an evaporatingchamber,

'a condensing chamber suitably connected with the evaporating chamber,condensing means connected with said condensing chamber, a receptacle tohold the condensed liquid, heating means. to heat the drying medium onits passage from the condensing chamber to the material to be dried,bearing surfaces to support the material while passing through theevaporating chamber and electrical conductors connected with saidbearing surfaces and grounding the same, means at each end of theevaporating chamber for coating the material with the coating substanceand forspreading it on said with the evaporating chamber, condensingmeans connected with said condensing chamber, heating means to heat thedrying medium on Its passage from the condensing chamber to the materialto be dried, means to support the material while passing through theevaporating chamber, means for coating the material with the coatingsubstance and forspreading it on said material, said coating andspreading means being in'closed in a chamber at the end of theevaporating chamber, and a removable drip tank in said last mentionedchamber to catch the surplus of the coating substance and adoor forminga substantially tight joint with said chamber thetank. I

28. In a drying apparatus, the combination of an evaporating chamber, acondensing chamber suitably connected with'the evaporating chamber,condensing means connected with said condensing chamber, heating meansto heat the drying medium on its passage from the condensing chamber tothe material being dried, means to support the material while passingthrough the evaporating chamber, inlet and outlet openings for thematerial in the evaporating chamber on the same level with each otherand holding devices at each end of said evaporating chamberto maintain atension on the material.

29. In a drying apparatus, the combinaT for the withdrawal of tion ofan'evaporating chamber, a condcns-.

ing chamber suitably connected with the evaporating chamber, condensingmeans connected with said. condensing chamber, heating means to heat thedrying medium on its passage from the condensing chamber tdthe materialbeing dried, means to support the material while passing through theevapo rating chamber, inlet and outlet openlngs for the material in theevaporating chamber provided with spring pieces to bear against andinclose the material and, holding devices at each end of saidevaporatingchamber to maintain a tension on the material.

3O. In a drying apparatus, the combination of an evaporating chan'ibcr,a condensing chamber suitably connected with the evaporating chamber,condensing means connected with said condensing chamber, a. rece tacle'to hold the condensed liquid, the con ensingtubes extending downsubstantially to the bottom of said receptacle,heatingmeans to heat thedrying medium before it comes into contact with the material benam'eS tothis specification, in the presence 1ng dried, means to support thematerial of two subscribing witnesses.

Wh11e passing through the evaporatin T 'GEORGE M chamber, and holdingdevices at each e115 3 WILLIAM M. GROSVENOR.

5 0i Said evaporating chamber to maintain av \Vitnesses: tension on thematerial. T. E; RAFTERYQ In testimony whereof, We have signed our EDWINSEGER.

Coriectio ns in Letters" Patent No. 979,731.

It-is hereby certified that in Letters'Patent No. 979,781, grantedDecember 27, I 1910, upon the application of George H. May, of Newburgh,New York, and William M Grosven'or, of Grantwood, New Jersey, for'animprovement in Drying v Apparatus, errors appear in the printedspecification requiring correction follows: Page 4, line 127, the wordspearing should read spreading, andpag line 36, the words and syllable Sand from the driving vand holding de-: should I stricken outand thewords sa'id condensing chamber; a receptacle be inserted insteadfi andthat the said Letters Patent should be read with these correctionstherein thati the Blame. may conform to the record of the case in thePatent Ohio er.

r Signed and sealed this 3th day of August,A. D., 1911.

[S L] .E.'B.-MOORE,

Commisgioner of Patents.

it comes into contact with the material benam'eS to this specification,in the presence 1ng dried, means to support the material of twosubscribing witnesses.

Wh11e passing through the evaporatin T 'GEORGE M chamber, and holdingdevices at each e115 3 WILLIAM M. GROSVENOR.

5 0i Said evaporating chamber to maintain av \Vitnesses: tension on thematerial. T. E; RAFTERYQ In testimony whereof, We have signed our EDWINSEGER.

Coriectio ns in Letters" Patent No. 979,731.

It-is hereby certified that in Letters'Patent No. 979,781, grantedDecember 27, I 1910, upon the application of George H. May, of Newburgh,New York, and William M Grosven'or, of Grantwood, New Jersey, for'animprovement in Drying v Apparatus, errors appear in the printedspecification requiring correction follows: Page 4, line 127, the wordspearing should read spreading, andpag line 36, the words and syllable Sand from the driving vand holding de-: should I stricken outand thewords sa'id condensing chamber; a receptacle be inserted insteadfi andthat the said Letters Patent should be read with these correctionstherein thati the Blame. may conform to the record of the case in thePatent Ohio er.

r Signed and sealed this 3th day of August,A. D., 1911.

[S L] .E.'B.-MOORE,

Commisgioner of Patents.

It is hereby certified that in Letters Patent No. 979,781, grantedDecember 27, 1910, upon the application of George H. May, of Newburgh,New York, and William M. Grosvenor, of Grantwood, New Jersey, for animprovement in Drying A aratus errors a ear in the rinted s eeilicationre uirin correctiodas a P P 1 1 follows: Page 1, line 127, the wordspearing should read spreading, and page 7,

line 36, the words and syllable fand from the driving and holdingdeshould be stricken out and the words said condensing char/7607', areceptacle be inserted instead; and that the said Letters Patent shouldbe read with these corrections therein that the same may conform to therecord of the case in the Patent Office.

Signed and sealed this 8th day of August, A. 1)., 1911.

[SEAL] E. B. MOORE,

Commissioner of Patents.

